US20070221173A1 - Fluid apparatus having pumps and method for controlling the same - Google Patents
Fluid apparatus having pumps and method for controlling the same Download PDFInfo
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- US20070221173A1 US20070221173A1 US11/714,808 US71480807A US2007221173A1 US 20070221173 A1 US20070221173 A1 US 20070221173A1 US 71480807 A US71480807 A US 71480807A US 2007221173 A1 US2007221173 A1 US 2007221173A1
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- Prior art keywords
- fuel
- pump
- downstream
- fluid
- pressure
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
- F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
- F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/16—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps characterised by having multi-stage compression of fuel
Definitions
- the present invention relates to a fluid apparatus having pumps connected in series.
- the present invention further relates to a method for controlling the fluid apparatus.
- JP-A-5-39763 discloses a pressure regulator for controlling pressure of fuel supplied to fuel injection valves.
- the pressure regulator has a spring chamber serving as a back pressure chamber.
- set pressure of the pressure regulator is controlled by switching pressure in the spring chamber to either air intake pressure or the atmospheric pressure.
- the controllable pressure range of the pressure regulator is narrow within the difference between the atmospheric pressure and the maximum negative pressure in the air intake pipe.
- the load applied to the fuel pump does not largely change. Consequently, change in the electricity consumption of the fuel pump is small, and the fuel pump may consume a large amount of electricity in an operating condition where the engine does not require high pressure fuel.
- JP-A-7-293397 voltage applied to the fuel pump is controlled in accordance with the difference between the detection pressure and the target pressure, so that power consumption of the fuel pump changes in accordance with the operating condition of the engine.
- power consumption of the fuel pump can be reduced.
- an electric fuel pump is designed to produce optimum efficiency when the fuel pump is applied with the maximum voltage. Therefore, when the voltage applied to the fuel pump decreases, the efficiency of the fuel pump decreases.
- driving current supplied to an electric motor of the fuel pump is I.
- Voltage applied to the electric motor of the fuel pump is V.
- Discharge pressure of the fuel pump is P.
- a discharge amount of the fuel pump is Q.
- JP-A-7-293397 the voltage applied to the fuel pump is controlled in accordance with the difference between the detection pressure and the target pressure, so that the power consumption of the fuel pump can be decreased.
- the efficiency of the fuel pump decreases.
- a fluid apparatus for supplying fluid into a fluid-receiving devce.
- the fluid apparatus includes an upstream pump, which is electrically driven, having an outlet port.
- the fluid apparatus further includes a downstream pump, which is electrically driven, having an inlet port that is connected with the outlet port in series.
- the fluid apparatus further includes an open-close unit.
- the open-close unit communicates a fluid passage, through which the upstream pump supplies fluid to the fluid-receiving devce, when the downstream pomp stops.
- the open-close unit blocks the fluid passage when the downstream pomp operates.
- FIG. 1 is a schematic view showing a fluid apparatus provided to an internal combustion engine, according to a first embodiment
- FIG. 2 is a flowchart showing an operation of a downstream fuel pump of the fluid apparatus in accordance with an operating condition of the engine
- FIG. 3 is a flowchart showing an operation of the downstream fuel pump when the engine is stopped
- FIG. 4 is a schematic view showing a fluid apparatus according to a second embodiment.
- FIG. 5 is a schematic view showing a fluid apparatus according to a third embodiment.
- a fluid apparatus 10 is provided to an internal combustion engine (fluid-receiving device) 6 such that the fluid apparatus 10 serves as a fuel feed apparatus to supply fuel from a fuel tank (not shown) into a fuel rail 2 .
- the fuel rail 2 is connected with fuel injection valves 4 each being provided to a corresponding cylinder of the internal combustion engine 6 .
- the fluid apparatus 10 includes, two fuel pumps 20 , 30 that are accommodated in the fuel tank.
- the fuel pump (upstream fuel pump) 20 has an outlet port 22 connected with an inlet port 31 of the fuel pump (downstream fuel pump) 30 through a pipe 200 , so that the fuel pumps 20 , 30 are connected in series.
- Each of the fuel pumps 20 , 30 is, for example, an electric turbine pump that includes an electric motor for rotating an impeller to pump fuel.
- the upstream fuel pump 20 draws fuel through the inlet port 21 , pressurizes the drawn fuel, and discharges the pressurized fuel through the outlet port 22 .
- a pressure regulator 24 is provided for controlling pressure of fuel discharged from the upsrteam fuel pump 20 .
- the pressure regulator 24 serves as a pressure control unit.
- the downstream fuel pump 30 is connected to the downstream of the upstream fuel pump 20 .
- the upstream fuel pump 20 discharges fuel, and the pressure regulator 24 controls the discharged fuel in pressure, so that the downstream fuel pump 30 draws the pressure-controlled fuel through the inlet port 31 .
- the downstream fuel pump 30 pressurizes the drawn fuel, thereby discharging the pressurized fuel through the outlet port 32 .
- a pressure regulator 34 is provided for controlling pressure of the fuel discharged from the downstream fuel pump 30 .
- the pressure regulator 24 serves as a pressure control unit. Set pressure of the pressure regulator 34 is greater than set pressure of the pressure regulator 24 .
- a pipe 210 is provided to connect the outlet port 32 of the downstream fuel pump 30 with the fuel rail 2 .
- the pipe 200 connects with the pipe 210 through a pipe 202 .
- a check valve 26 is provided to the pipe 202 .
- the check valve 26 serves as an open-close unit.
- the check valve 26 permits flowing of fuel from the pipe 200 on a discharge side of the upstream fuel pump 20 toward the pipe 210 on the side of the engine 6 .
- the check valve 26 regulates flowing of fuel from the pipe 210 to the pipe 200 .
- the check valve 26 is, for example, a generally known mechanical valve that includes a spring applying force to a ball in a direction to regulate flowing of fuel from the pipe 210 to the pipe 200 .
- An engine control unit (ECU ) 100 is constructed of a CPU, a ROM, and a RAM (nor shown).
- the ECU 100 serves as a control unit.
- the CPU executes a program stored in the ROM, thereby turning electricity, which is supplied to the downstream fuel pump 30 , ON and OFF in accordance with the operating condition of the engine 6 . That is, the ECU 100 starts and stops the downstream fuel pump 30 in accordance with the operating condition of the engine 6 .
- the ECU 100 turns the electricity supplied to the upstream fuel pump 20 ON in a period between starting and stopping of the engine 6 . That is, the ECU 100 regularly operates the upstream fuel pump 20 .
- the ECU 100 turns electricity of the upstream fuel pump 20 ON from staring of the engine 6 to stopping the engine 6 , so that the ECU 100 regularly operates the upstream fuel pump 20 .
- the ECU 100 turns electricity of the downstream fuel pump 30 OFF to stop the downstream fuel pump 30 , in the condition where the upstream fuel pump 20 is operated, so that the check valve 26 is opened by being applied with the discharge pressure of the upstream fuel pump 20 , and the check valve 26 communicates the pipe 202 therein.
- the pressure regulator 24 controls pressure of fuel discharged from the upstream fuel pump 20 .
- the pressure-controlled fuel is supplied from the check valve 26 to the fuel rail 2 through the pipes 202 , 210 .
- the ECU 100 turns electricity of the downstream fuel pump 30 ON to start the downstream fuel pump 30 , in the condition where the upstream fuel pump 20 is operated, so that the downstream fuel pump 30 draws fuel, which is discharged from the upstream fuel pump 20 and pressure-controlled by the pressure regulator 24 , through the pipe 200 and the inlet port 31 .
- the downstream fuel pump 30 pressurizes fuel, which is drawn through the inlet port 31 , and discharges the pressurized fuel through the outlet port 32 .
- the downstream fuel pump 30 further pressurizes fuel, which is pressurized by the upstream fuel pump 20 , so that discharge pressure of the downstream fuel pump 30 becomes higher than discharge pressure of the upstream fuel pump 20 .
- the pressure regulator 34 controls pressure of the fuel discharged from the downstream fuel pump 30 .
- the set pressure of the pressure regulator 34 is higher than the set pressure of the pressure regulator 24 by, for example, setting spring force high in the pressure regulator 34 .
- the downstream fuel pump 30 supplies fuel, which is higher than the upstream fuel pump 20 in discharge pressure, to the fuel rail 2 through the pipe 210 .
- the check valve 26 When the downstream fuel pump 30 discharges fuel, the check valve 26 is closed by being applied with pressure difference between discharge pressure of the upstream fuel pump 20 and discharge pressure of the downstream fuel pump 30 , so that the check valve 26 blocks the pipe 202 therein. In this condition, fuel discharged from the upstream fuel pump 20 is not supplied directly to the pipe 210 .
- the CPU of the ECU 100 executes control programs stored in the ROM of the ECU 100 , thereby executing the routines shown by FIGS. 2 , 3 .
- the ECU 100 detects the operating condition of the engine 6 , so that the ECU 100 sets pressure of fuel injected from the fuel injection valves 4 at either high pressure or low pressure, in accordance with the detected operating condition of the engine 6 .
- pressure of fuel supplied to the fuel injection valves 4 is preferably set high, for accelerating atomization of fuel in a low temperature condition, and for both accelerating atomization of fuel and regulating generation of vapor in fuel in a high temperature condition.
- pressure of fuel supplied to the fuel injection valves 4 may be set low when the engine 6 is imposed with low load in a condition such as constant cruising of the vehicle.
- step 302 the ECU 100 evaluates whether the set pressure of fuel is high or low. When the set pressure is low, the step 302 makes a negative determination, and the routine proceeds to step 304 in which the ECU 100 evaluates whether the downstream fuel pump 30 operates, i.e., runs. When the set pressure is low in step 302 , and the ECU 100 turns electricity OFF to stop the downstream fuel pump 30 in step 304 , the routine returns the routine to step 300 . When the set pressure is low in step 302 , and the ECU 100 turns electricity ON to operate the downstream fuel pump 30 in step 304 , step 304 makes a positive determination, so that the routine proceeds to step 306 . In step 306 , the ECU 100 turns electricity OFF to stop the downstream fuel pump 30 so as to decrease pressure of fuel supplied from the fluid apparatus 10 to the fuel rail 2 . Thus, the routine returns to step 300 .
- step 302 makes a positive determination, and the routine proceeds to step 308 in which the ECU 100 evaluates whether the downstream fuel pump 30 operates.
- the routine returns to step 300 .
- step 308 makes a negative determination, so that the routine proceeds to step 310 .
- step 310 the ECU 100 turns electricity ON to operate the downstream fuel pump 30 so as to increase pressure of fuel supplied from the fluid apparatus 10 to the fuel rail 2 .
- the routine returns to step 300 .
- the ECU 100 turns electricity of the downstream fuel pump 30 ON and OFF, in accordance with the operating condition of the engine 6 .
- the ECU 100 turns electricity of the downstream fuel pump 30 ON.
- the ECU 100 turns electricity of the downstream fuel pump 30 OFF.
- the ECU 100 applies constant maximum voltage to each of the fuel pumps 20 , 30 , instead of variably controlling voltage applied to each of the fuel pumps 20 , 30 .
- the efficiency of each of the fuel pumps 20 , 30 can be maiintained substantially optimum by applying the maximum voltage to each of the fuel pumps 20 , 30 . Therefore, the efficiency of each of the fuel pumps 20 , 30 can be enhanced compared with variably controlling the voltage applied to each of the fuel pumps 20 , 30 .
- step 320 the ECU 100 evaluates whether the engine 6 is being stopped.
- the step 320 makes a positive determination, and the routine proceeds to step 322 in which the ECU 100 evaluates whether the downstream fuel pump 30 operates.
- step 322 makes a positive determination, so that the routine proceeds to step 324 .
- step 324 the ECU 100 turns electricity OFF to stop the downstream fuel pump 30 .
- the check valve 26 is opened by being applied with discharge pressure of the upstream fuel pump 20 . Consequently, fuel discharged from the upstream fuel pump 20 is supplied directly to the fuel rail 2 , so that pressure of fuel in the fuel rail 2 decreases.
- the ECU 100 waits for a predetermined period after turning electricity of the downstream fuel pump 30 OFF. Subsequently, the routine proceeds to step 326 after elapsing the predetermined period. In step 326 , the ECU 100 turns electricity OFF to stop the upstream fuel pump 20 .
- step 320 When the engine 6 is being stopped in step 320 and the ECU 100 already turns electricity OFF to stop the downstream fuel pump 30 in step 322 , the routine proceeds to step 326 .
- step 326 the ECU 100 turns electricity OFF to stop the upstream fuel pump 20 .
- the ECU 100 stops the downstream fuel pump 30 prior to stopping the upstream fuel pump 20 .
- pressure of fuel supplied to the fuel rail 2 is beforehand decreased, so that pressure of fuel in the fuel rail 2 is set low when the engine 6 stops. Therefore, pressure in the the fuel rail 2 can be regulated, so that fuel can be restricted from leaking through the fuel injection valves 4 , when the engine 6 is being stopped.
- the check valve 26 when the downstream fuel pump 30 operates, the check valve 26 brocks the pipe 202 through which the upstream fuel pump 20 directly connects with the fuel rail 2 .
- the check valve 26 communicates the pipe 202 , so that the upstream fuel pump 20 directly supplies fuel into the fuel rail 2 throug the pipe 202 .
- the open-close unit can be produced with the check valve 26 having a simple structure.
- the pipe 200 is provided to communicate the outlet port 22 with the inlet port 31 .
- a pipe 204 is further provided to communicate the outlet port 32 with an inlet port 41 .
- three fuel pumps 20 , 30 , 40 are connected in series in this order from the upstream.
- the downmost stream fuel pump 40 has an outlet port 42 through which the downmost stream fuel pump 40 is connected with the pipe 210 .
- a check valve 36 is further provided to a pipe 206 that connects the pipe 204 with the pipe 210 .
- the check valve 36 communicates and brocks the pipe 206 therein in accordance with pressure difference between the pipe 204 and the pipe 210 .
- First set pressure of a pressure regulator 44 is determined to be greater than second set pressure of the pressure regulator 34 .
- the second set pressure of the pressure regulator 34 is determined to be greater than third set pressure of the pressure regulator 24 . That is, first set pressure>second set pressure>third set pressure.
- the check valve 26 When the fuel pumps 20 , 30 operate and the downmost stream fuel pump 40 stop, the check valve 26 is closed by being applied with pressure difference between discharge pressure of the uppermost stream fuel pump 20 and discharge pressure of the middlestream fuel pump 30 . In this condition, the check valve 36 opens, so that fuel, which is discharged from the middlestream fuel pump 30 and pressure-controlled by the pressure regulator 34 , is supplied to the fuel rail 2 .
- the check valves 26 , 36 are closed by being applied with pressure difference between discharge pressure of the fuel pumps 20 , 30 , 40 .
- fuel which is discharged from the downmost stream fuel pump 40 and pressure-controlled by the pressure regulator 44 , is supplied to the fuel rail 2 .
- the pressure regulator 44 serves as a pressure control unit.
- pressure in the fuel rail 2 can be decreased by stopping from the downmost stream fuel pump 40 to the fuel pumps 30 , 20 in this order, similarly to the first embodiment.
- a check valve 38 is provided in the vicinity of the outlet port 32 of the downstream fuel pump 30 , in addition to the fluid apparatus 10 of the first embodiment.
- the check valve 38 opens when fuel flows from the downstream fuel pump 30 to the fuel rail 2 .
- the check valve 38 blocks flowing of fuel from the fuel rail 2 to the downstream fuel pump 30 .
- the check valve 38 restricts further leakage of fuel from the fuel rail 2 .
- the check valve 26 which serves as an open-close unit, is capable of restrciting fuel from reverseflowing from the fuel rail 2 when the engine 6 stops.
- the check valves 26 , 38 are capable of maintaining pressure of fuel in the fuel rail 2 in the condition where the engine 6 stops.
- multiple fuel pumps are connected in series, so that the discharge pressure can be enhanced from the upstream fuel pump to the downstream fuel pump. Therefore, pressure of fuel supplied to the engine can be enhanced substantially without jumboizing each fuel pump.
- downstream fuel pump is turned ON and OFF in accordance with the operating condition of the engine, so that power consumption of the fluid apparatus, which includes the fuel pumps connected in series, can be reduced.
- two or three fuel pumps are connected in series.
- four or more fuel pumps may be connected in series.
- the open-close unit is constructed of the check valve.
- the check valve 26 , 36 blocks the pipe through which the fuel pump in the upstream of the operating fuel pump directly connects with the fuel rail 2 .
- the check valve 26 , 36 communicates the pipe through which the fuel pump in the upstream of the stopping fuel pump supplies fuel to the fuel rail 2 .
- the check valve serves as the open-close unit, so that the open-close unit can be produced with a simple structure, and the open-close unit need not be controlled.
- the fluid apparatus can be smallsized and simplified compared with providing an electrically controlled valve manipulated using a controller such as the ECU 100 .
- a three-way valve may be provided to the connection between the fuel pumps, so as to serve as an open-close unit, and the ECU 100 may control to switch the three way valve.
- the pressure regulator controls the discharge pressure of each pump.
- the pressure regulator need not control the discharge pressure of each pump. Fuel discharged from the fuel pump may be supplied directly to the fuel rail 2 .
- the above processings such as calculations and determinations are not limited being executed by the ECU 100 .
- the control unit may have various structures and combinations including the ECU 100 shown as an example.
- the fluid apparatus is used for supplying fuel to an engine.
- the fluid apparatus is not limited to application to an engine.
- Fluid is not limited to fuel.
- the feed apparatus can be used for any other hydraulic system for enhancing energy consumption and pump efficiency by providing multiple pumps.
Abstract
Description
- This application is based on and incorporates herein by reference Japanese Patent Application No. 2006-80127 filed on Mar. 23, 2006.
- The present invention relates to a fluid apparatus having pumps connected in series. The present invention further relates to a method for controlling the fluid apparatus.
- JP-A-5-39763 discloses a pressure regulator for controlling pressure of fuel supplied to fuel injection valves. The pressure regulator has a spring chamber serving as a back pressure chamber. In this structure, set pressure of the pressure regulator is controlled by switching pressure in the spring chamber to either air intake pressure or the atmospheric pressure.
- According to JP-A-7-293397, voltage applied to the fuel pump is controlled in accordance with the difference between target pressure and detection pressure, which indicates pressure of fuel supplied to the fuel injection valves.
- In JP-A-5-39763, the controllable pressure range of the pressure regulator is narrow within the difference between the atmospheric pressure and the maximum negative pressure in the air intake pipe. Accodingly, the load applied to the fuel pump does not largely change. Consequently, change in the electricity consumption of the fuel pump is small, and the fuel pump may consume a large amount of electricity in an operating condition where the engine does not require high pressure fuel.
- According to JP-A-7-293397, voltage applied to the fuel pump is controlled in accordance with the difference between the detection pressure and the target pressure, so that power consumption of the fuel pump changes in accordance with the operating condition of the engine. Thus, power consumption of the fuel pump can be reduced.
- However, in general, an electric fuel pump is designed to produce optimum efficiency when the fuel pump is applied with the maximum voltage. Therefore, when the voltage applied to the fuel pump decreases, the efficiency of the fuel pump decreases. The efficiency η of the fuel pump is defined by: η=(P×Q)/(I×V). Here, driving current supplied to an electric motor of the fuel pump is I. Voltage applied to the electric motor of the fuel pump is V. Discharge pressure of the fuel pump is P. A discharge amount of the fuel pump is Q. In JP-A-7-293397, the voltage applied to the fuel pump is controlled in accordance with the difference between the detection pressure and the target pressure, so that the power consumption of the fuel pump can be decreased. However, the efficiency of the fuel pump decreases.
- It is required to further enhance atomization of fuel, which is injected from fuel injection valves, in order to reduce unburned component in exhaust gas emitted from an engine or in order to facilitate engine start in a low temperature condition or a high temperature condition. In order to enhance atomization of fuel, it is conceived effective that, for example, increasing pressure of fuel supplied to the engine, not only improving fuel injection valves such as a shape of an injection nozzle thereof. In JP-A-5-39763 and JP-A-7-293397, pressure of fuel supplied to fuel injection valves can be increased by jumboizing the fuel pump to enhance discharge pressure of the fuel pump. However, when the fuel pump is jumboized, electricity consumption becomes large, and efficiency of the fuel pump decreases.
- As disclosed in JP-A-2003-293883, when two fuel pumps are connected in series, pressure of fuel supplied to the engine can be enhanced without jumboizing the fuel pump. Thus, the fuel pumps need not be jumboized by driving both the two fuel pumps connected in series. However, even in this structure, electricity consumption becomes large, and efficiency of the fuel pump decreases in each of the fuel pumps.
- The present invention addresses the above disadvantage. According to one aspect of the present invention, a fluid apparatus is provided for supplying fluid into a fluid-receiving devce. The fluid apparatus includes an upstream pump, which is electrically driven, having an outlet port. The fluid apparatus further includes a downstream pump, which is electrically driven, having an inlet port that is connected with the outlet port in series. The fluid apparatus further includes an open-close unit. The open-close unit communicates a fluid passage, through which the upstream pump supplies fluid to the fluid-receiving devce, when the downstream pomp stops. The open-close unit blocks the fluid passage when the downstream pomp operates.
- According to another aspect of the present invention, a method for controlling a fluid apparatus, which includes an upstream pump and a downstream pump connected in series for supplying fuel to a fuel rail of an internal combustion engine, includes starting the upstream pump. The method further includes starting the downstream pump in accordance with an operating condition of the internal combustion engine so as to increase pressure of fuel in the fuel rail. The method further includes blocking a fuel passage, via which the upstream pump directly is connected with the fuel rail, when the downstream pump is started. The method further includes stopping the downstream pump in accordance with the operating condition of the internal combustion engine so as to decrease pressure of fuel in the fuel rail. The method further includes communicating the fuel passage so as to supply fuel from the upstream pump directly to the fuel rail when the downstream pump is stopped.
- The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:
-
FIG. 1 is a schematic view showing a fluid apparatus provided to an internal combustion engine, according to a first embodiment; -
FIG. 2 is a flowchart showing an operation of a downstream fuel pump of the fluid apparatus in accordance with an operating condition of the engine; -
FIG. 3 is a flowchart showing an operation of the downstream fuel pump when the engine is stopped; -
FIG. 4 is a schematic view showing a fluid apparatus according to a second embodiment; and -
FIG. 5 is a schematic view showing a fluid apparatus according to a third embodiment. - In this embodiment, as shown in
FIG. 1 , afluid apparatus 10 is provided to an internal combustion engine (fluid-receiving device) 6 such that thefluid apparatus 10 serves as a fuel feed apparatus to supply fuel from a fuel tank (not shown) into afuel rail 2. Thefuel rail 2 is connected withfuel injection valves 4 each being provided to a corresponding cylinder of theinternal combustion engine 6. - The
fluid apparatus 10 includes, twofuel pumps outlet port 22 connected with aninlet port 31 of the fuel pump (downstream fuel pump) 30 through apipe 200, so that thefuel pumps fuel pumps - The
upstream fuel pump 20 draws fuel through theinlet port 21, pressurizes the drawn fuel, and discharges the pressurized fuel through theoutlet port 22. Apressure regulator 24 is provided for controlling pressure of fuel discharged from theupsrteam fuel pump 20. Thepressure regulator 24 serves as a pressure control unit. Thedownstream fuel pump 30 is connected to the downstream of theupstream fuel pump 20. Theupstream fuel pump 20 discharges fuel, and thepressure regulator 24 controls the discharged fuel in pressure, so that thedownstream fuel pump 30 draws the pressure-controlled fuel through theinlet port 31. Thedownstream fuel pump 30 pressurizes the drawn fuel, thereby discharging the pressurized fuel through theoutlet port 32. Apressure regulator 34 is provided for controlling pressure of the fuel discharged from thedownstream fuel pump 30. Thepressure regulator 24 serves as a pressure control unit. Set pressure of thepressure regulator 34 is greater than set pressure of thepressure regulator 24. - A
pipe 210 is provided to connect theoutlet port 32 of thedownstream fuel pump 30 with thefuel rail 2. Thepipe 200 connects with thepipe 210 through apipe 202. Acheck valve 26 is provided to thepipe 202. Thecheck valve 26 serves as an open-close unit. Thecheck valve 26 permits flowing of fuel from thepipe 200 on a discharge side of theupstream fuel pump 20 toward thepipe 210 on the side of theengine 6. Thecheck valve 26 regulates flowing of fuel from thepipe 210 to thepipe 200. Thecheck valve 26 is, for example, a generally known mechanical valve that includes a spring applying force to a ball in a direction to regulate flowing of fuel from thepipe 210 to thepipe 200. - An engine control unit (ECU ) 100 is constructed of a CPU, a ROM, and a RAM (nor shown). The
ECU 100 serves as a control unit. In theECU 100, the CPU executes a program stored in the ROM, thereby turning electricity, which is supplied to thedownstream fuel pump 30, ON and OFF in accordance with the operating condition of theengine 6. That is, theECU 100 starts and stops thedownstream fuel pump 30 in accordance with the operating condition of theengine 6. TheECU 100 turns the electricity supplied to theupstream fuel pump 20 ON in a period between starting and stopping of theengine 6. That is, theECU 100 regularly operates theupstream fuel pump 20. - Next, a relationship between operating conditions of the fuel pumps 20, 30 and pressure of fuel supplied from the
fluid apparatus 10 to thefuel rail 2 is described. - As described above, the
ECU 100 turns electricity of theupstream fuel pump 20 ON from staring of theengine 6 to stopping theengine 6, so that theECU 100 regularly operates theupstream fuel pump 20. - The
ECU 100 turns electricity of thedownstream fuel pump 30 OFF to stop thedownstream fuel pump 30, in the condition where theupstream fuel pump 20 is operated, so that thecheck valve 26 is opened by being applied with the discharge pressure of theupstream fuel pump 20, and thecheck valve 26 communicates thepipe 202 therein. Thepressure regulator 24 controls pressure of fuel discharged from theupstream fuel pump 20. The pressure-controlled fuel is supplied from thecheck valve 26 to thefuel rail 2 through thepipes - The
ECU 100 turns electricity of thedownstream fuel pump 30 ON to start thedownstream fuel pump 30, in the condition where theupstream fuel pump 20 is operated, so that thedownstream fuel pump 30 draws fuel, which is discharged from theupstream fuel pump 20 and pressure-controlled by thepressure regulator 24, through thepipe 200 and theinlet port 31. Thedownstream fuel pump 30 pressurizes fuel, which is drawn through theinlet port 31, and discharges the pressurized fuel through theoutlet port 32. Thedownstream fuel pump 30 further pressurizes fuel, which is pressurized by theupstream fuel pump 20, so that discharge pressure of thedownstream fuel pump 30 becomes higher than discharge pressure of theupstream fuel pump 20. Thepressure regulator 34 controls pressure of the fuel discharged from thedownstream fuel pump 30. The set pressure of thepressure regulator 34 is higher than the set pressure of thepressure regulator 24 by, for example, setting spring force high in thepressure regulator 34. Thus, thedownstream fuel pump 30 supplies fuel, which is higher than theupstream fuel pump 20 in discharge pressure, to thefuel rail 2 through thepipe 210. - When the
downstream fuel pump 30 discharges fuel, thecheck valve 26 is closed by being applied with pressure difference between discharge pressure of theupstream fuel pump 20 and discharge pressure of thedownstream fuel pump 30, so that thecheck valve 26 blocks thepipe 202 therein. In this condition, fuel discharged from theupstream fuel pump 20 is not supplied directly to thepipe 210. - Next, an operation of the
fluid apparatus 10 is further described in reference toFIGS. 2 , 3. Specifically, the CPU of theECU 100 executes control programs stored in the ROM of theECU 100, thereby executing the routines shown byFIGS. 2 , 3. - As referred to
FIG. 2 , in step 300, theECU 100 detects the operating condition of theengine 6, so that theECU 100 sets pressure of fuel injected from thefuel injection valves 4 at either high pressure or low pressure, in accordance with the detected operating condition of theengine 6. For example, when theengine 6 is started, pressure of fuel supplied to thefuel injection valves 4 is preferably set high, for accelerating atomization of fuel in a low temperature condition, and for both accelerating atomization of fuel and regulating generation of vapor in fuel in a high temperature condition. Alternatively, pressure of fuel supplied to thefuel injection valves 4 may be set low when theengine 6 is imposed with low load in a condition such as constant cruising of the vehicle. - In
step 302, theECU 100 evaluates whether the set pressure of fuel is high or low. When the set pressure is low, thestep 302 makes a negative determination, and the routine proceeds to step 304 in which theECU 100 evaluates whether thedownstream fuel pump 30 operates, i.e., runs. When the set pressure is low instep 302, and theECU 100 turns electricity OFF to stop thedownstream fuel pump 30 instep 304, the routine returns the routine to step 300. When the set pressure is low instep 302, and theECU 100 turns electricity ON to operate thedownstream fuel pump 30 instep 304,step 304 makes a positive determination, so that the routine proceeds to step 306. Instep 306, theECU 100 turns electricity OFF to stop thedownstream fuel pump 30 so as to decrease pressure of fuel supplied from thefluid apparatus 10 to thefuel rail 2. Thus, the routine returns to step 300. - When the set pressure is high in
step 302, thestep 302 makes a positive determination, and the routine proceeds to step 308 in which theECU 100 evaluates whether thedownstream fuel pump 30 operates. When the set pressure is high instep 302, and theECU 100 turns electricity ON to operate thedownstream fuel pump 30 instep 308, the routine returns to step 300. When the set pressure is high instep 302 and theECU 100 turns electricity OFF to stop thedownstream fuel pump 30 instep 308,step 308 makes a negative determination, so that the routine proceeds to step 310. Instep 310, theECU 100 turns electricity ON to operate thedownstream fuel pump 30 so as to increase pressure of fuel supplied from thefluid apparatus 10 to thefuel rail 2. Thus, the routine returns to step 300. - In these operations, the
ECU 100 turns electricity of thedownstream fuel pump 30 ON and OFF, in accordance with the operating condition of theengine 6. When theengine 6 requires high pressure fuel, theECU 100 turns electricity of thedownstream fuel pump 30 ON. When theengine 6 does not require high pressure fuel, theECU 100 turns electricity of thedownstream fuel pump 30 OFF. Thus, electricity consumption of thefluid apparatus 10 can be reduced compared with a structure in which the fuel pumps 20, 30 are regularly operated. - Furthermore, the
ECU 100 applies constant maximum voltage to each of the fuel pumps 20, 30, instead of variably controlling voltage applied to each of the fuel pumps 20, 30. The efficiency of each of the fuel pumps 20, 30 can be maiintained substantially optimum by applying the maximum voltage to each of the fuel pumps 20, 30. Therefore, the efficiency of each of the fuel pumps 20, 30 can be enhanced compared with variably controlling the voltage applied to each of the fuel pumps 20, 30. - Next, operations of the fuel pumps 20, 30 in stopping the
engine 6 are described in reference toFIG. 3 . - In
step 320, theECU 100 evaluates whether theengine 6 is being stopped. When theengine 6 is being stopped, thestep 320 makes a positive determination, and the routine proceeds to step 322 in which theECU 100 evaluates whether thedownstream fuel pump 30 operates. - When the
engine 6 is being stopped instep 320 and theECU 100 turns electricity ON to operate thedownstream fuel pump 30,step 322 makes a positive determination, so that the routine proceeds to step 324. Instep 324, theECU 100 turns electricity OFF to stop thedownstream fuel pump 30. When thedownstream fuel pump 30 stops, thecheck valve 26 is opened by being applied with discharge pressure of theupstream fuel pump 20. Consequently, fuel discharged from theupstream fuel pump 20 is supplied directly to thefuel rail 2, so that pressure of fuel in thefuel rail 2 decreases. TheECU 100 waits for a predetermined period after turning electricity of thedownstream fuel pump 30 OFF. Subsequently, the routine proceeds to step 326 after elapsing the predetermined period. Instep 326, theECU 100 turns electricity OFF to stop theupstream fuel pump 20. - When the
engine 6 is being stopped instep 320 and theECU 100 already turns electricity OFF to stop thedownstream fuel pump 30 instep 322, the routine proceeds to step 326. Instep 326, theECU 100 turns electricity OFF to stop theupstream fuel pump 20. - In these operations, when the
engine 6 is being stopped and both the fuel pumps 20, 30 are operated, theECU 100 stops thedownstream fuel pump 30 prior to stopping theupstream fuel pump 20. Thus, pressure of fuel supplied to thefuel rail 2 is beforehand decreased, so that pressure of fuel in thefuel rail 2 is set low when theengine 6 stops. Therefore, pressure in the thefuel rail 2 can be regulated, so that fuel can be restricted from leaking through thefuel injection valves 4, when theengine 6 is being stopped. - Furthermore, in this embodiment, when the
downstream fuel pump 30 operates, thecheck valve 26 brocks thepipe 202 through which theupstream fuel pump 20 directly connects with thefuel rail 2. Alternatively, when thedownstream fuel pump 30 stops, thecheck valve 26 communicates thepipe 202, so that theupstream fuel pump 20 directly supplies fuel into thefuel rail 2 throug thepipe 202. In this configuration, the open-close unit can be produced with thecheck valve 26 having a simple structure. - As shown in
FIG. 4 , in afluid apparatus 12 of this embodiment, thepipe 200 is provided to communicate theoutlet port 22 with theinlet port 31. Apipe 204 is further provided to communicate theoutlet port 32 with aninlet port 41. In this structure, threefuel pumps stream fuel pump 40 has anoutlet port 42 through which the downmoststream fuel pump 40 is connected with thepipe 210. Acheck valve 36 is further provided to apipe 206 that connects thepipe 204 with thepipe 210. Thecheck valve 36 communicates and brocks thepipe 206 therein in accordance with pressure difference between thepipe 204 and thepipe 210. First set pressure of apressure regulator 44 is determined to be greater than second set pressure of thepressure regulator 34. The second set pressure of thepressure regulator 34 is determined to be greater than third set pressure of thepressure regulator 24. That is, first set pressure>second set pressure>third set pressure. - When the uppermost
stream fuel pump 20 operates and the downstream fuel pumps 30, 40 stop, thecheck valve 26 opens and thecheck valve 36 closes. In this condition, fuel, which is discharged from thefuel pump 20 and pressure-controlled by thepressure regulator 24, is supplied directly to thefuel rail 2 through thecheck valve 26. - When the fuel pumps 20, 30 operate and the downmost
stream fuel pump 40 stop, thecheck valve 26 is closed by being applied with pressure difference between discharge pressure of the uppermoststream fuel pump 20 and discharge pressure of themiddlestream fuel pump 30. In this condition, thecheck valve 36 opens, so that fuel, which is discharged from themiddlestream fuel pump 30 and pressure-controlled by thepressure regulator 34, is supplied to thefuel rail 2. - When all the fuel pumps 20, 30, 40 operate, the
check valves stream fuel pump 40 and pressure-controlled by thepressure regulator 44, is supplied to thefuel rail 2. Thepressure regulator 44 serves as a pressure control unit. - When the
engine 6 is being stopped, pressure in thefuel rail 2 can be decreased by stopping from the downmoststream fuel pump 40 to the fuel pumps 30, 20 in this order, similarly to the first embodiment. - In the
fluid apparatus 10 of the first embodiment, when theengine 6 stops, high pressure in thefuel rail 2 is applied directly to thedownstream fuel pump 30. In this condition, fuel may slightly leak from thefuel rail 2 to the downstream of thefuel rail 2 through thedownstream fuel pump 30, when thedownstream fuel pump 30 does not have sufficient blockade performance to restrict fuel from reversflowing. As a result, pressure in thefuel rail 2 decreases when theengine 6 stops. - By contrast, as shown in
FIG. 5 , in afluid apparatus 14 of this third embodiment, acheck valve 38 is provided in the vicinity of theoutlet port 32 of thedownstream fuel pump 30, in addition to thefluid apparatus 10 of the first embodiment. Thecheck valve 38 opens when fuel flows from thedownstream fuel pump 30 to thefuel rail 2. Thecheck valve 38 blocks flowing of fuel from thefuel rail 2 to thedownstream fuel pump 30. - In the
fluid apparatus 14 of this third embodiment, even when fuel leaks in thedownstream fuel pump 30, thecheck valve 38 restricts further leakage of fuel from thefuel rail 2. In addition, thecheck valve 26, which serves as an open-close unit, is capable of restrciting fuel from reverseflowing from thefuel rail 2 when theengine 6 stops. Thus, even when the fuel pumps 20, 30 do not have sufficient blockade performance, thecheck valves fuel rail 2 in the condition where theengine 6 stops. - In the above embodiments, multiple fuel pumps are connected in series, so that the discharge pressure can be enhanced from the upstream fuel pump to the downstream fuel pump. Therefore, pressure of fuel supplied to the engine can be enhanced substantially without jumboizing each fuel pump.
- Furthermore, the downstream fuel pump is turned ON and OFF in accordance with the operating condition of the engine, so that power consumption of the fluid apparatus, which includes the fuel pumps connected in series, can be reduced.
- In the above embodiments, two or three fuel pumps are connected in series. Alternatively, four or more fuel pumps may be connected in series.
- In the above embodiments, the open-close unit is constructed of the check valve. When the downstream fuel pump operates, the
check valve fuel rail 2. When the downstream fuel pump stops, thecheck valve fuel rail 2. The check valve serves as the open-close unit, so that the open-close unit can be produced with a simple structure, and the open-close unit need not be controlled. Thus, the fluid apparatus can be smallsized and simplified compared with providing an electrically controlled valve manipulated using a controller such as theECU 100. For example, a three-way valve may be provided to the connection between the fuel pumps, so as to serve as an open-close unit, and theECU 100 may control to switch the three way valve. - In the above embodiments, the pressure regulator controls the discharge pressure of each pump. Alternatively, the pressure regulator need not control the discharge pressure of each pump. Fuel discharged from the fuel pump may be supplied directly to the
fuel rail 2. - The above processings such as calculations and determinations are not limited being executed by the
ECU 100. The control unit may have various structures and combinations including theECU 100 shown as an example. - The above structures of the embodiments can be combined as appropriate. In the above embodiments, the fluid apparatus is used for supplying fuel to an engine. However, the fluid apparatus is not limited to application to an engine. Fluid is not limited to fuel. The feed apparatus can be used for any other hydraulic system for enhancing energy consumption and pump efficiency by providing multiple pumps.
- It should be appreciated that while the processes of the embodiments of the present invention have been described herein as including a specific sequence of steps, further alternative embodiments including various other sequences of these steps and/or additional steps not disclosed herein are intended to be within the steps of the present invention.
- Various modifications and alternations may be diversely made to the above embodiments without departing from the spirit of the present invention.
Claims (8)
Applications Claiming Priority (2)
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JP2006-80127 | 2006-03-23 | ||
JP2006080127A JP4415275B2 (en) | 2006-03-23 | 2006-03-23 | Fuel supply device |
Publications (2)
Publication Number | Publication Date |
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US20070221173A1 true US20070221173A1 (en) | 2007-09-27 |
US7392794B2 US7392794B2 (en) | 2008-07-01 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/714,808 Active US7392794B2 (en) | 2006-03-23 | 2007-03-07 | Fluid apparatus having pumps and method for controlling the same |
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US (1) | US7392794B2 (en) |
JP (1) | JP4415275B2 (en) |
DE (1) | DE102007000171A1 (en) |
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US20110088484A1 (en) * | 2009-10-21 | 2011-04-21 | Schlumberger Technology Corporation | System, method, and computer readable medium for calculating well flow rates produced with electrical submersible pumps |
CN102052215A (en) * | 2009-11-04 | 2011-05-11 | 沈阳玄潭汽车部件有限公司 | Electric fuel pump for motorcycle |
CN102235276A (en) * | 2010-04-26 | 2011-11-09 | 三菱电机株式会社 | Fuel supplying device and fuel supplying system |
US20130255271A1 (en) * | 2012-03-30 | 2013-10-03 | General Electric Company | Fuel Supply System |
US8683981B2 (en) | 2010-10-26 | 2014-04-01 | Mitsubishi Electric Corporation | Fuel supply system |
US20140121943A1 (en) * | 2012-10-31 | 2014-05-01 | Hyundai Motor Company | Control system and control method of gasoline direct injection engine |
US20150240601A1 (en) * | 2012-09-10 | 2015-08-27 | Tco As | Injection device |
US20160245205A1 (en) * | 2013-11-19 | 2016-08-25 | Renault S.A.S | Method and system for supplying diesel to a motor vehicle |
US10753361B2 (en) | 2014-04-25 | 2020-08-25 | Sensia Llc | ESP pump flow rate estimation and control |
US10876393B2 (en) | 2014-05-23 | 2020-12-29 | Sensia Llc | Submersible electrical system assessment |
US11041349B2 (en) | 2018-10-11 | 2021-06-22 | Schlumberger Technology Corporation | Automatic shift detection for oil and gas production system |
US11613985B2 (en) | 2013-11-13 | 2023-03-28 | Sensia Llc | Well alarms and event detection |
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JP4737132B2 (en) * | 2007-04-19 | 2011-07-27 | 日産自動車株式会社 | Engine fuel pump control device |
JP4893817B2 (en) * | 2009-12-23 | 2012-03-07 | 株式会社デンソー | Fuel supply device |
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US9476742B2 (en) * | 2009-10-21 | 2016-10-25 | Schlumberger Technology Corporation | System, method, and computer readable medium for calculating well flow rates produced with electrical submersible pumps |
US8527219B2 (en) * | 2009-10-21 | 2013-09-03 | Schlumberger Technology Corporation | System, method, and computer readable medium for calculating well flow rates produced with electrical submersible pumps |
US20110088484A1 (en) * | 2009-10-21 | 2011-04-21 | Schlumberger Technology Corporation | System, method, and computer readable medium for calculating well flow rates produced with electrical submersible pumps |
US20130317762A1 (en) * | 2009-10-21 | 2013-11-28 | Schlumberger Technology Corporation | System, Method, And Computer Readable Medium For Calculating Well Flow Rates Produced With Electrical Submersible Pumps |
CN102052215A (en) * | 2009-11-04 | 2011-05-11 | 沈阳玄潭汽车部件有限公司 | Electric fuel pump for motorcycle |
CN102235276A (en) * | 2010-04-26 | 2011-11-09 | 三菱电机株式会社 | Fuel supplying device and fuel supplying system |
US8683981B2 (en) | 2010-10-26 | 2014-04-01 | Mitsubishi Electric Corporation | Fuel supply system |
US9822703B2 (en) * | 2012-03-30 | 2017-11-21 | General Electric Company | Fuel supply system |
US20130255271A1 (en) * | 2012-03-30 | 2013-10-03 | General Electric Company | Fuel Supply System |
US20150240601A1 (en) * | 2012-09-10 | 2015-08-27 | Tco As | Injection device |
US9347392B2 (en) * | 2012-10-31 | 2016-05-24 | Hyundai Motor Company | Control system and control method of gasoline direct injection engine |
US20140121943A1 (en) * | 2012-10-31 | 2014-05-01 | Hyundai Motor Company | Control system and control method of gasoline direct injection engine |
US11613985B2 (en) | 2013-11-13 | 2023-03-28 | Sensia Llc | Well alarms and event detection |
US20160245205A1 (en) * | 2013-11-19 | 2016-08-25 | Renault S.A.S | Method and system for supplying diesel to a motor vehicle |
US10202921B2 (en) * | 2013-11-19 | 2019-02-12 | Renault S.A.S. | Method and system for supplying diesel to a motor vehicle |
US10753361B2 (en) | 2014-04-25 | 2020-08-25 | Sensia Llc | ESP pump flow rate estimation and control |
US11353029B2 (en) | 2014-04-25 | 2022-06-07 | Sensia Llc | ESP pump flow rate estimation and control |
US10876393B2 (en) | 2014-05-23 | 2020-12-29 | Sensia Llc | Submersible electrical system assessment |
US11041349B2 (en) | 2018-10-11 | 2021-06-22 | Schlumberger Technology Corporation | Automatic shift detection for oil and gas production system |
Also Published As
Publication number | Publication date |
---|---|
US7392794B2 (en) | 2008-07-01 |
JP2007255281A (en) | 2007-10-04 |
DE102007000171A1 (en) | 2007-10-04 |
JP4415275B2 (en) | 2010-02-17 |
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